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ipw2200: Check for -1 INTA in tasklet too.

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This is an attempt to fix a long standing open bug:
http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=1334

The interrupt handler checks for INTA being -1, apparently that means that the
hardware is gone. But the interrupt handler defers actual interrupt processing
to a tasklet. By the time the tasklet is run and checks INTA again, the
hardware might be gone and INTA be -1, which confuses the driver because all
event bits are set.

The patch applies to 2.6.37.

Signed-off-by: Indan Zupancic <indan@nul.nu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Indan Zupancic 2011-01-08 12:17:27 +01:00 committed by John W. Linville
parent ed70c6e60e
commit 3c4a8cc46e
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/ipw2x00/ipw2200.c
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@ -1973,6 +1973,13 @@ static void ipw_irq_tasklet(struct ipw_priv *priv)
inta = ipw_read32(priv, IPW_INTA_RW);
inta_mask = ipw_read32(priv, IPW_INTA_MASK_R);
if (inta == 0xFFFFFFFF) {
/* Hardware disappeared */
IPW_WARNING("TASKLET INTA == 0xFFFFFFFF\n");
/* Only handle the cached INTA values */
inta = 0;
}
inta &= (IPW_INTA_MASK_ALL & inta_mask);
/* Add any cached INTA values that need to be handled */