* [PATCH 4/7] AT91 UDC, fix recursive poll()
@ 2013-03-12 16:03 Renaud C.
2013-03-13 10:31 ` Cerrato Renaud
0 siblings, 1 reply; 2+ messages in thread
From: Renaud C. @ 2013-03-12 16:03 UTC (permalink / raw)
To: barebox
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I noticed some weird behavior using DFU gadget on AT91SAM9260 which worked
1 of 10 times. The bug was due to the usb_gadget_poll() being called while
the previous call was still in progress : some USB calls may takes a lot of
time (ex : DFU erase-then-write), resulting in the poller to be triggered
again while still in the poll() function.
This patch adds a poll lock to the AT91 UDC driver.
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From c9e73cbb704f8e4e3c13a712587f0b4fbbdfcac7 Mon Sep 17 00:00:00 2001
From: Cerrato Renaud <r.cerrato@til-technologies.fr>
Date: Mon, 11 Mar 2013 11:06:06 +0100
Subject: [PATCH] added missing lock for poll
---
drivers/usb/gadget/at91_udc.c | 14 ++++++++------
drivers/usb/gadget/at91_udc.h | 1 +
2 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 0654038..8ae9119 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1340,22 +1340,24 @@ int usb_gadget_poll(void)
struct at91_udc *udc = &controller;
u32 value;
- if (!udc->udp_baseaddr)
+ if (!udc->udp_baseaddr || udc->poll_lock)
return 0;
+ udc->poll_lock = 1;
+
value = gpio_get_value(udc->board.vbus_pin);
value ^= udc->board.vbus_active_low;
-
- if (!value) {
- at91_update_vbus(udc, value);
- return 0;
- }
at91_update_vbus(udc, value);
+ if (!value)
+ goto exit;
+
value = at91_udp_read(udc, AT91_UDP_ISR) & (~(AT91_UDP_SOFINT));
if (value)
at91_udc_irq(udc);
+exit:
+ udc->poll_lock = 0;
return value;
}
diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h
index e592cc5..51145a9 100644
--- a/drivers/usb/gadget/at91_udc.h
+++ b/drivers/usb/gadget/at91_udc.h
@@ -127,6 +127,7 @@ struct at91_udc {
unsigned wait_for_config_ack:1;
unsigned selfpowered:1;
unsigned active_suspend:1;
+ unsigned poll_lock:1;
u8 addr;
u32 gpio_vbus_val;
struct at91_udc_data board;
--
1.7.2.5
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH 4/7] AT91 UDC, fix recursive poll()
2013-03-12 16:03 [PATCH 4/7] AT91 UDC, fix recursive poll() Renaud C.
@ 2013-03-13 10:31 ` Cerrato Renaud
0 siblings, 0 replies; 2+ messages in thread
From: Cerrato Renaud @ 2013-03-13 10:31 UTC (permalink / raw)
To: barebox
Inlined patch below.
Signed-off-by: Cerrato Renaud <r.cerrato@til-technologies.fr>
---
drivers/usb/gadget/at91_udc.c | 14 ++++++++------
drivers/usb/gadget/at91_udc.h | 1 +
2 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 0654038..8ae9119 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1340,22 +1340,24 @@ int usb_gadget_poll(void)
struct at91_udc *udc = &controller;
u32 value;
- if (!udc->udp_baseaddr)
+ if (!udc->udp_baseaddr || udc->poll_lock)
return 0;
+ udc->poll_lock = 1;
+
value = gpio_get_value(udc->board.vbus_pin);
value ^= udc->board.vbus_active_low;
-
- if (!value) {
- at91_update_vbus(udc, value);
- return 0;
- }
at91_update_vbus(udc, value);
+ if (!value)
+ goto exit;
+
value = at91_udp_read(udc, AT91_UDP_ISR) & (~(AT91_UDP_SOFINT));
if (value)
at91_udc_irq(udc);
+exit:
+ udc->poll_lock = 0;
return value;
}
diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h
index e592cc5..51145a9 100644
--- a/drivers/usb/gadget/at91_udc.h
+++ b/drivers/usb/gadget/at91_udc.h
@@ -127,6 +127,7 @@ struct at91_udc {
unsigned wait_for_config_ack:1;
unsigned selfpowered:1;
unsigned active_suspend:1;
+ unsigned poll_lock:1;
u8 addr;
u32 gpio_vbus_val;
struct at91_udc_data board;
--
1.7.2.5
On 12/03/2013 17:03, Renaud C. wrote:
> I noticed some weird behavior using DFU gadget on AT91SAM9260 which worked 1 of 10 times. The bug was due to the usb_gadget_poll() being called while the previous call was still in progress : some USB calls may takes a lot of time (ex : DFU erase-then-write), resulting in the poller to be triggered again while still in the poll() function.
>
> This patch adds a poll lock to the AT91 UDC driver.
>
>
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
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