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dc155e1acb
Commit ce70fd9a55 ("scsi: core: Remove the cmd field from struct
scsi_request") refactored scsi_bsg_sg_io_fn() so that it does not allocate
directly and hence does not return -ENOMEM in its error case. That makes a
remaining assignment of -ENOMEM to the return variable needless.
Drop this needless assignment in scsi_bsg_sg_io_fn().
No functional change. No change in resulting object code.
Link: https://lore.kernel.org/r/20220315055325.14974-1-lukas.bulwahn@gmail.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bsg.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/sg.h>
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#include "scsi_priv.h"
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#define uptr64(val) ((void __user *)(uintptr_t)(val))
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static int scsi_bsg_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
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fmode_t mode, unsigned int timeout)
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{
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struct scsi_cmnd *scmd;
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struct request *rq;
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struct bio *bio;
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int ret;
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if (hdr->protocol != BSG_PROTOCOL_SCSI ||
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hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
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return -EINVAL;
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if (hdr->dout_xfer_len && hdr->din_xfer_len) {
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pr_warn_once("BIDI support in bsg has been removed.\n");
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return -EOPNOTSUPP;
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}
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rq = scsi_alloc_request(q, hdr->dout_xfer_len ?
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REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
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if (IS_ERR(rq))
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return PTR_ERR(rq);
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rq->timeout = timeout;
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scmd = blk_mq_rq_to_pdu(rq);
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scmd->cmd_len = hdr->request_len;
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if (scmd->cmd_len > sizeof(scmd->cmnd)) {
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ret = -EINVAL;
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goto out_put_request;
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}
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ret = -EFAULT;
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if (copy_from_user(scmd->cmnd, uptr64(hdr->request), scmd->cmd_len))
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goto out_put_request;
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ret = -EPERM;
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if (!scsi_cmd_allowed(scmd->cmnd, mode))
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goto out_put_request;
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ret = 0;
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if (hdr->dout_xfer_len) {
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ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
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hdr->dout_xfer_len, GFP_KERNEL);
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} else if (hdr->din_xfer_len) {
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ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp),
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hdr->din_xfer_len, GFP_KERNEL);
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}
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if (ret)
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goto out_put_request;
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bio = rq->bio;
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blk_execute_rq(rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL));
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/*
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* fill in all the output members
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*/
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hdr->device_status = scmd->result & 0xff;
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hdr->transport_status = host_byte(scmd->result);
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hdr->driver_status = 0;
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if (scsi_status_is_check_condition(scmd->result))
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hdr->driver_status = DRIVER_SENSE;
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hdr->info = 0;
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if (hdr->device_status || hdr->transport_status || hdr->driver_status)
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hdr->info |= SG_INFO_CHECK;
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hdr->response_len = 0;
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if (scmd->sense_len && hdr->response) {
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int len = min_t(unsigned int, hdr->max_response_len,
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scmd->sense_len);
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if (copy_to_user(uptr64(hdr->response), scmd->sense_buffer,
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len))
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ret = -EFAULT;
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else
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hdr->response_len = len;
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}
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if (rq_data_dir(rq) == READ)
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hdr->din_resid = scmd->resid_len;
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else
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hdr->dout_resid = scmd->resid_len;
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blk_rq_unmap_user(bio);
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out_put_request:
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blk_mq_free_request(rq);
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return ret;
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}
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struct bsg_device *scsi_bsg_register_queue(struct scsi_device *sdev)
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{
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return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev,
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dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn);
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}
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