A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 10:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

ide-cd: fix DMA alignment regression

Browse source 
e5318b531b ("ide: use the dma safe check for
REQ_TYPE_ATA_PC") introduced a regression which caused some ATAPI drives to
turn off DMA for REQ_TYPE_BLOCK_PC commands while burning and thus degrading
performance and ultimately causing an excessive amount of underruns.

The issue is documented also in:
http://bugzilla.kernel.org/show_bug.cgi?id=11742.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: FUJITA Tomonori <[email protected]>
Tested-by: Valerio Passini <[email protected]>
[bart: fixup patch description per comments from Sergei Shtylyov]
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
This commit is contained in:
Borislav Petkov 2008-11-02 21:40:07 +01:00 • committed by Bartlomiej Zolnierkiewicz
commit 9bd27cba1a
1 changed files with 2 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/ide/ide-cd.c
View file

@ -1250,7 +1250,8 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
* separate masks.
*/
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
if ((unsigned long)buf & alignment || rq->data_len & alignment
if ((unsigned long)buf & alignment
|| rq->data_len & q->dma_pad_mask
|| object_is_on_stack(buf))
drive->dma = 0;
}