tree 8ba3384b5dc10f7fca38de998e36366d5b2c8c4f
parent 2ba30eedec37e2f65babf4ea54233f98afbe0871
author Nicolas Pitre <nico@cam.org> 1187644657 -0400
committer Pierre Ossman <drzeus@drzeus.cx> 1190575492 +0200

sdio: fix recursion issues between sdio-uart driver and tty layer

In a few places, sdio_uart_irq() is called directly instead of waiting
for the actual interrupt to be raised and the SDIO IRQ thread scheduled
in order to reduce latency.  However, some interaction with the tty core
may end up calling us back (serial echo, flow control, etc.) creating
two issues:

 - the host lock gets claimed twice from the same thread causing a
   deadlock;

 - the same direct calls to sdio_uart_irq() may be performed causing
   unexpected reentrancy into the IRQ handler.

This patch handles both of those issues.

Signed-off-by: Nicolas Pitre <npitre@mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>