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authorTrent Piepho <tpiepho@freescale.com>2008-09-22 10:03:56 -0700
committerJeff Garzik <jgarzik@redhat.com>2008-09-24 20:48:56 -0400
commitbaac03d9bb7b8aa3c33a2dbf5f459ea6ce8abaf4 (patch)
tree018e47dc43acfff4a63d3974c981340ba729cac2 /drivers/net/gianfar_mii.c
parent2e2e8d53c3f34684af7a7475098b7524a6b854c2 (diff)
gianfar: Fix error in mdio reset timeout
The loop with the timeout used "while (... && timeout--)", which means than when the timeout occurs, "timeout" will be -1 after the loop has exited. The code that checks if the looped exited because of a timeout used "if (timeout <= 0)". Seems ok, except timeout is unsigned, and (unsigned)-1 isn't less than zero! Using "--timeout" in the loop fixes this problem, as now "timeout" will be 0 when the loop times out. This also fixes a bug in the existing code, where it will erroneously think a timeout occurred if the condition the loop was waiting for is satisfied on the final iteration before a timeout. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/gianfar_mii.c')
-rw-r--r--drivers/net/gianfar_mii.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/gianfar_mii.c b/drivers/net/gianfar_mii.c
index ebcfb27a904..906aba2757e 100644
--- a/drivers/net/gianfar_mii.c
+++ b/drivers/net/gianfar_mii.c
@@ -136,12 +136,12 @@ static int gfar_mdio_reset(struct mii_bus *bus)
/* Wait until the bus is free */
while ((gfar_read(&regs->miimind) & MIIMIND_BUSY) &&
- timeout--)
+ --timeout)
cpu_relax();
mutex_unlock(&bus->mdio_lock);
- if(timeout <= 0) {
+ if(timeout == 0) {
printk(KERN_ERR "%s: The MII Bus is stuck!\n",
bus->name);
return -EBUSY;