From: Andrew Morton <[email protected]>
We must disable local IRQs while holding KM_IRQ0 or KM_IRQ1. Otherwise, an
IRQ handler could use those kmap slots while this code is using them,
resulting in memory corruption.
Thanks to Nick Orlov <[email protected]> for reporting.
Cc: <[email protected]>
Cc: James Bottomley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/scsi/3w-xxxx.c | 3 +++
1 file changed, 3 insertions(+)
--- linux-2.6.16.9.orig/drivers/scsi/3w-xxxx.c
+++ linux-2.6.16.9/drivers/scsi/3w-xxxx.c
@@ -1508,10 +1508,12 @@ static void tw_transfer_internal(TW_Devi
struct scsi_cmnd *cmd = tw_dev->srb[request_id];
void *buf;
unsigned int transfer_len;
+ unsigned long flags = 0;
if (cmd->use_sg) {
struct scatterlist *sg =
(struct scatterlist *)cmd->request_buffer;
+ local_irq_save(flags);
buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
transfer_len = min(sg->length, len);
} else {
@@ -1526,6 +1528,7 @@ static void tw_transfer_internal(TW_Devi
sg = (struct scatterlist *)cmd->request_buffer;
kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ local_irq_restore(flags);
}
}
--
-
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