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media: dvb-frontends: drx39xyj: Refactor firmware upload

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Do not cache the file, instead load it on demand.

This makes smatch a happy parser:
drivers/media/dvb-frontends/drx39xyj/drxj.c:11908 drx_ctrl_u_code() warn: 'fw' from request_firmware() not released on lines: 11877,11886,11896.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Ricardo Ribalda 2024-04-11 21:17:55 +00:00 committed by Hans Verkuil
parent 8e1f5da59d
commit 7bc6966115
2 changed files with 24 additions and 29 deletions
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2
drivers/media/dvb-frontends/drx39xyj/drx_driver.h
View File

@ -33,7 +33,6 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
/*
@ -1910,7 +1909,6 @@ struct drx_demod_instance {
/* generic demodulator data */
struct i2c_adapter *i2c;
const struct firmware *firmware;
};
/*-------------------------------------------------------------------------

51
drivers/media/dvb-frontends/drx39xyj/drxj.c
View File

@ -56,6 +56,7 @@ INCLUDE FILES
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
@ -11750,6 +11751,7 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
u8 *mc_data = NULL;
unsigned size;
char *mc_file;
const struct firmware *fw;
/* Check arguments */
if (!mc_info || !mc_info->mc_file)
@ -11757,28 +11759,22 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
mc_file = mc_info->mc_file;
if (!demod->firmware) {
const struct firmware *fw = NULL;
rc = request_firmware(&fw, mc_file, demod->i2c->dev.parent);
if (rc < 0) {
pr_err("Couldn't read firmware %s\n", mc_file);
return rc;
}
demod->firmware = fw;
if (demod->firmware->size < 2 * sizeof(u16)) {
rc = -EINVAL;
pr_err("Firmware is too short!\n");
goto release;
}
pr_info("Firmware %s, size %zu\n",
mc_file, demod->firmware->size);
rc = request_firmware(&fw, mc_file, demod->i2c->dev.parent);
if (rc < 0) {
pr_err("Couldn't read firmware %s\n", mc_file);
return rc;
}
mc_data_init = demod->firmware->data;
size = demod->firmware->size;
if (fw->size < 2 * sizeof(u16)) {
rc = -EINVAL;
pr_err("Firmware is too short!\n");
goto release;
}
pr_info("Firmware %s, size %zu\n", mc_file, fw->size);
mc_data_init = fw->data;
size = fw->size;
mc_data = (void *)mc_data_init;
/* Check data */
@ -11874,7 +11870,8 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
0x0000)) {
pr_err("error reading firmware at pos %zd\n",
mc_data - mc_data_init);
return -EIO;
rc = -EIO;
goto release;
}
result = memcmp(curr_ptr, mc_data_buffer,
@ -11883,7 +11880,8 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
if (result) {
pr_err("error verifying firmware at pos %zd\n",
mc_data - mc_data_init);
return -EIO;
rc = -EIO;
goto release;
}
curr_addr += ((dr_xaddr_t)(bytes_to_comp / 2));
@ -11893,17 +11891,17 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
break;
}
default:
return -EINVAL;
rc = -EINVAL;
goto release;
}
mc_data += mc_block_nr_bytes;
}
return 0;
rc = 0;
release:
release_firmware(demod->firmware);
demod->firmware = NULL;
release_firmware(fw);
return rc;
}
@ -12271,7 +12269,6 @@ static void drx39xxj_release(struct dvb_frontend *fe)
kfree(demod->my_ext_attr);
kfree(demod->my_common_attr);
kfree(demod->my_i2c_dev_addr);
release_firmware(demod->firmware);
kfree(demod);
kfree(state);
}