FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-14 21:01:29 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[libata] pata_efar: add locking for parallel scanning

Browse Source 
Add clearing of UDMA enable bit also for PIO modes and then add
extra locking for parallel scanning.

This is similar change as commit 60c3be3 for ata_piix host driver
and while pata_efar doesn't enable parallel scan yet the race could
probably also be triggered by requesting re-scanning of both ports
at the same time using SCSI sysfs interface.

[Ported to current kernel without other patch dependancies by
 Alan Cox]

Original is
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

This one is
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2010-02-17 13:16:58 +00:00 committed by Jeff Garzik
parent 16ea0fc98d
commit 303f1a76ae
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/ata/pata_efar.c
View File

@ -68,6 +68,8 @@ static int efar_cable_detect(struct ata_port *ap)
return ATA_CBL_PATA80;
}
static DEFINE_SPINLOCK(efar_lock);
/**
* efar_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
@ -84,7 +86,9 @@ static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
unsigned int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *dev = to_pci_dev(ap->host->dev);
unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
unsigned long flags;
u16 idetm_data;
u8 udma_enable;
int control = 0;
/*
@ -107,6 +111,8 @@ static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
if (adev->class == ATA_DEV_ATA)
control |= 4; /* PPE */
spin_lock_irqsave(&efar_lock, flags);
pci_read_config_word(dev, idetm_port, &idetm_data);
/* Set PPE, IE, and TIME as appropriate */
@ -131,6 +137,11 @@ static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
idetm_data |= 0x4000; /* Ensure SITRE is set */
pci_write_config_word(dev, idetm_port, idetm_data);
pci_read_config_byte(dev, 0x48, &udma_enable);
udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
pci_write_config_byte(dev, 0x48, udma_enable);
spin_unlock_irqrestore(&efar_lock, flags);
}
/**
@ -151,6 +162,7 @@ static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
u16 master_data;
u8 speed = adev->dma_mode;
int devid = adev->devno + 2 * ap->port_no;
unsigned long flags;
u8 udma_enable;
static const /* ISP RTC */
@ -160,6 +172,8 @@ static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{ 2, 1 },
{ 2, 3 }, };
spin_lock_irqsave(&efar_lock, flags);
pci_read_config_word(dev, master_port, &master_data);
pci_read_config_byte(dev, 0x48, &udma_enable);
@ -217,6 +231,7 @@ static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
pci_write_config_word(dev, master_port, master_data);
}
pci_write_config_byte(dev, 0x48, udma_enable);
spin_unlock_irqrestore(&efar_lock, flags);
}
static struct scsi_host_template efar_sht = {