When configuring my system with three Xilinx Gpio devices using
drivers/char/xilinx_gpio, my system would hang during bootup. I isolated the
problem to the xilinx_gpio driver, on an error condition in xgpio_probe.
When the second device was probed, the request_irq failed leaving the
inst_list_sem locked, so when the third probe started it blocked on
acquiring the lock.
The attached patch, applied with
cd petalinux-dist
patch -p0 xilinx_gpio.patch
releases the lock on failure.
*** linux-2.6.x/drivers/char/xilinx_gpio/Oadapter.c 2007-07-30
18:16:49.000000000 -0400
--- linux-2.6.x/drivers/char/xilinx_gpio/adapter.c 2007-07-30
18:38:13.000000000 -0400
***************
*** 449,454 ****
--- 449,455 ----
minor--;
failed3:
+ up_write(&inst_list_sem);
iounmap((void *)(xgpio_config.BaseAddress));
failed2:
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