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scsi: atari_scsi: Make device register accessors re-entrant

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This patch fixes an old bug: accesses to device registers from the
interrupt handler (after reselection, DMA completion etc.) could mess
up a device register access elsewhere, if the latter takes place outside
of an irq lock (during selection etc.).

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2016-10-10 00:46:52 -04:00 committed by Martin K. Petersen
parent b223680da0
commit abd12b0929
1 changed files with 15 additions and 3 deletions
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18
drivers/scsi/atari_scsi.c
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@ -670,14 +670,26 @@ static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value)
static unsigned char atari_scsi_falcon_reg_read(unsigned char reg)
{
dma_wd.dma_mode_status= (u_short)(0x88 + reg);
return (u_char)dma_wd.fdc_acces_seccount;
unsigned long flags;
unsigned char result;
reg += 0x88;
local_irq_save(flags);
dma_wd.dma_mode_status = (u_short)reg;
result = (u_char)dma_wd.fdc_acces_seccount;
local_irq_restore(flags);
return result;
}
static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value)
{
dma_wd.dma_mode_status = (u_short)(0x88 + reg);
unsigned long flags;
reg += 0x88;
local_irq_save(flags);
dma_wd.dma_mode_status = (u_short)reg;
dma_wd.fdc_acces_seccount = (u_short)value;
local_irq_restore(flags);
}