Commit 6183289c authored by Sergei Shtylyov's avatar Sergei Shtylyov Committed by Bartlomiej Zolnierkiewicz

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.


This fixes regression from commit 66602c83
("cmd64x: use interrupt status from MRDMODE register (take 2)").

Extra thanks to Martin for reporting and bisecting the issue.

From: Sergei Shtylyov <>
Tested-by: default avatarMartin Rogge <>
Tested-by: default avatarMilan Kocian <>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <>
parent 9418d5dc
* 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;
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