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ata: sata_mv, avoid trigerrable BUG_ON
There are several reports that the BUG_ON on unsupported command in mv_qc_prep can be triggered under some circumstances: https://bugzilla.suse.com/show_bug.cgi?id=1110252 https://serverfault.com/questions/888897/raid-problems-after-power-outage https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1652185 https://bugs.centos.org/view.php?id=14998 Let sata_mv handle the failure gracefully: warn about that incl. the failed command number and return an AC_ERR_INVALID error. We can do that now thanks to the previous patch. Remove also the long-standing FIXME. [v2] use %.2x as commands are defined as hexa. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: linux-ide@vger.kernel.org Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -2098,12 +2098,10 @@ static enum ata_completion_errors mv_qc_prep(struct ata_queued_cmd *qc)
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* non-NCQ mode are: [RW] STREAM DMA and W DMA FUA EXT, none
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* of which are defined/used by Linux. If we get here, this
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* driver needs work.
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*
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* FIXME: modify libata to give qc_prep a return value and
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* return error here.
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*/
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BUG_ON(tf->command);
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break;
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ata_port_err(ap, "%s: unsupported command: %.2x\n", __func__,
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tf->command);
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return AC_ERR_INVALID;
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}
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mv_crqb_pack_cmd(cw++, tf->nsect, ATA_REG_NSECT, 0);
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mv_crqb_pack_cmd(cw++, tf->hob_lbal, ATA_REG_LBAL, 0);
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