Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

usb: renesas_usbhs: fix the behavior of some usbhs_pkt_handle

Browse source 
Some gadget drivers will call usb_ep_queue() more than once before
the first queue doesn't finish. However, this driver didn't handle
it correctly. So, this patch fixes the behavior of some
usbhs_pkt_handle using the "running" flag. Otherwise, the oops below
happens if we use g_ncm driver and when the "iperf -u -c host -b 200M"
is running.

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 80000007 [#1] SMP ARM
Modules linked in: usb_f_ncm g_ncm libcomposite u_ether
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W      3.17.0-rc1-00008-g8b2be8a-dirty #20
task: c051c7e0 ti: c0512000 task.ti: c0512000
PC is at 0x0
LR is at usbhsf_pkt_handler+0xa8/0x114
pc : [<00000000>]    lr : [<c0278fb4>]    psr: 60000193
sp : c0513ce8  ip : c0513c58  fp : c0513d24
r10: 00000001  r9 : 00000193  r8 : eebec4a0
r7 : eebec410  r6 : eebe0c6c  r5 : 00000000  r4 : ee4a2774
r3 : 00000000  r2 : ee251e00  r1 : c0513cf4  r0 : ee4a2774

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Yoshihiro Shimoda 2014-08-22 20:13:50 +09:00 committed by Felipe Balbi
parent f0798d6a04
commit 8355b2b308
3 changed files with 41 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
drivers/usb/renesas_usbhs/fifo.c
View file

@ -544,6 +544,7 @@ static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
usbhsf_send_terminator(pipe, fifo);
usbhsf_tx_irq_ctrl(pipe, !*is_done);
usbhs_pipe_running(pipe, !*is_done);
usbhs_pipe_enable(pipe);
dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
@ -570,12 +571,21 @@ static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
* retry in interrupt
*/
usbhsf_tx_irq_ctrl(pipe, 1);
usbhs_pipe_running(pipe, 1);
return ret;
}
static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
{
if (usbhs_pipe_is_running(pkt->pipe))
return 0;
return usbhsf_pio_try_push(pkt, is_done);
}
struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
.prepare = usbhsf_pio_try_push,
.prepare = usbhsf_pio_prepare_push,
.try_run = usbhsf_pio_try_push,
};
@ -589,6 +599,9 @@ static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
if (usbhs_pipe_is_busy(pipe))
return 0;
if (usbhs_pipe_is_running(pipe))
return 0;
/*
* pipe enable to prepare packet receive
*/
@ -597,6 +610,7 @@ static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
usbhs_pipe_enable(pipe);
usbhs_pipe_running(pipe, 1);
usbhsf_rx_irq_ctrl(pipe, 1);
return 0;
@ -642,6 +656,7 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
(total_len < maxp)) { /* short packet */
*is_done = 1;
usbhsf_rx_irq_ctrl(pipe, 0);
usbhs_pipe_running(pipe, 0);
usbhs_pipe_disable(pipe); /* disable pipe first */
}
@ -805,6 +820,7 @@ static void xfer_work(struct work_struct *work)
dev_dbg(dev, " %s %d (%d/ %d)\n",
fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
usbhs_pipe_running(pipe, 1);
usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
usbhs_pipe_enable(pipe);
usbhsf_dma_start(pipe, fifo);
@ -836,6 +852,10 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
goto usbhsf_pio_prepare_push;
/* return at this time if the pipe is running */
if (usbhs_pipe_is_running(pipe))
return 0;
/* get enable DMA fifo */
fifo = usbhsf_get_dma_fifo(priv, pkt);
if (!fifo)
@ -873,6 +893,7 @@ static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
pkt->actual = pkt->trans;
*is_done = !pkt->zero; /* send zero packet ? */
usbhs_pipe_running(pipe, !*is_done);
usbhsf_dma_stop(pipe, pipe->fifo);
usbhsf_dma_unmap(pkt);
@ -972,8 +993,10 @@ static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
if ((pkt->actual == pkt->length) || /* receive all data */
(pkt->trans < maxp)) { /* short packet */
*is_done = 1;
usbhs_pipe_running(pipe, 0);
} else {
/* re-enable */
usbhs_pipe_running(pipe, 0);
usbhsf_prepare_pop(pkt, is_done);
}

13
drivers/usb/renesas_usbhs/pipe.c
View file

@ -578,6 +578,19 @@ int usbhs_pipe_is_dir_host(struct usbhs_pipe *pipe)
return usbhsp_flags_has(pipe, IS_DIR_HOST);
}
int usbhs_pipe_is_running(struct usbhs_pipe *pipe)
{
return usbhsp_flags_has(pipe, IS_RUNNING);
}
void usbhs_pipe_running(struct usbhs_pipe *pipe, int running)
{
if (running)
usbhsp_flags_set(pipe, IS_RUNNING);
else
usbhsp_flags_clr(pipe, IS_RUNNING);
}
void usbhs_pipe_data_sequence(struct usbhs_pipe *pipe, int sequence)
{
u16 mask = (SQCLR | SQSET);

4
drivers/usb/renesas_usbhs/pipe.h
View file

@ -36,6 +36,7 @@ struct usbhs_pipe {
#define USBHS_PIPE_FLAGS_IS_USED (1 << 0)
#define USBHS_PIPE_FLAGS_IS_DIR_IN (1 << 1)
#define USBHS_PIPE_FLAGS_IS_DIR_HOST (1 << 2)
#define USBHS_PIPE_FLAGS_IS_RUNNING (1 << 3)
struct usbhs_pkt_handle *handler;
@ -80,6 +81,9 @@ int usbhs_pipe_probe(struct usbhs_priv *priv);
void usbhs_pipe_remove(struct usbhs_priv *priv);
int usbhs_pipe_is_dir_in(struct usbhs_pipe *pipe);
int usbhs_pipe_is_dir_host(struct usbhs_pipe *pipe);
int usbhs_pipe_is_running(struct usbhs_pipe *pipe);
void usbhs_pipe_running(struct usbhs_pipe *pipe, int running);
void usbhs_pipe_init(struct usbhs_priv *priv,
int (*dma_map_ctrl)(struct usbhs_pkt *pkt, int map));
int usbhs_pipe_get_maxpacket(struct usbhs_pipe *pipe);