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libata debugging: Warn when unable to find timing descriptor based on xfer_mode

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ata_timing_find_mode could return NULL which is not checked by all
low-level ATA drivers using it and cause a NULL ptr deref. Warn at least
so that possible issues can get fixed easily.

Signed-off-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Borislav Petkov 2012-10-21 18:57:56 +02:00 • committed by Jeff Garzik
parent c37472d3f4
commit cd705d5ad4
1 changed files with 4 additions and 0 deletions
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4
drivers/ata/libata-core.c
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@ -2942,6 +2942,10 @@ const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
if (xfer_mode == t->mode) if (xfer_mode == t->mode)
return t; return t;
WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
__func__, xfer_mode);
return NULL; return NULL;
} }