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cmd64x: don't clear the other channel's interrupt 

Make sure to not clear the other IDE channel's interrupt when clearing an IDE
interrupt via the MRDMODE register.

Thanks to Bart for finding a coding mistake.

Bart:

This fixes regression from commit 66602c83dc
("cmd64x: use interrupt status from MRDMODE register (take 2)").

Extra thanks to Martin for reporting and bisecting the issue.

From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Tested-by: Martin Rogge <marogge@onlinehome.de>
Tested-by: Milan Kocian <milon@wq.cz>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Sergei Shtylyov 2007-11-13 22:09:14 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 9418d5dc9b
commit 6183289cd4
1 changed files with 3 additions and 2 deletions
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5
drivers/ide/pci/cmd64x.c
View File

@ -1,5 +1,5 @@
/*
* linux/drivers/ide/pci/cmd64x.c Version 1.50 May 10, 2007
* linux/drivers/ide/pci/cmd64x.c Version 1.51 Nov 8, 2007
*
* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
* Due to massive hardware bugs, UltraDMA is only supported
@ -339,7 +339,8 @@ static int cmd648_ide_dma_end (ide_drive_t *drive)
u8 mrdmode = inb(hwif->dma_master + 0x01);
/* clear the interrupt bit */
outb(mrdmode | irq_mask, hwif->dma_master + 0x01);
outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
hwif->dma_master + 0x01);
return err;
}