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usb: renesas_usbhs: modify fifo clear timing 

Pipe buffer should be cleaned before using it,
but should NOT be cleaned in pipe "prepare" function.
Because the pipe might be working in such timing.
This patch fixup this issue.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kuninori Morimoto 2011-04-21 14:09:58 +09:00 committed by Greg Kroah-Hartman
parent a0c25c2050
commit 45e13e6e0a
1 changed files with 4 additions and 10 deletions
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14
drivers/usb/renesas_usbhs/pipe.c
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@ -369,15 +369,7 @@ static int usbhsp_fifo_select(struct usbhs_pipe *pipe, int write)
int usbhs_fifo_prepare_write(struct usbhs_pipe *pipe)
{
int ret;
ret = usbhsp_fifo_select(pipe, 1);
if (ret < 0)
return ret;
usbhsp_fifo_clear(pipe);
return ret;
return usbhsp_fifo_select(pipe, 1);
}
int usbhs_fifo_write(struct usbhs_pipe *pipe, u8 *buf, int len)
@ -392,7 +384,7 @@ int usbhs_fifo_write(struct usbhs_pipe *pipe, u8 *buf, int len)
if (ret < 0)
return ret;
ret = usbhs_fifo_prepare_write(pipe);
ret = usbhsp_fifo_select(pipe, 1);
if (ret < 0)
return ret;
@ -750,6 +742,8 @@ void usbhs_pipe_init(struct usbhs_priv *priv)
usbhsp_flags_init(pipe);
pipe->mod_private = NULL;
usbhsp_fifo_clear(pipe);
}
}