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| author | David Vrabel <david.vrabel@csr.com> | 2009-08-25 16:41:06 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@csr.com> | 2009-08-26 12:39:29 +0100 |
| commit | 0396c215f301e92677d1e9a064b405e31501dc1d (patch) | |
| tree | a54229672abc6f244fcf184701b8a8bf98b70544 /drivers/uwb | |
| parent | a9e75a389254801ca160b72c6e221e5bb7e35df9 (diff) | |
| download | lwn-0396c215f301e92677d1e9a064b405e31501dc1d.tar.gz lwn-0396c215f301e92677d1e9a064b405e31501dc1d.zip | |
uwb: avoid radio controller reset loops
If a radio controller reset attempt occurs while a probe() or remove()
is in progress it fails and is retried endlessly, potentially preventing
the probe() or remove() from completing.
If a reset fails, sleep for a bit before retrying the reset. This
allows the probe()/remove() to complete.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Diffstat (limited to 'drivers/uwb')
| -rw-r--r-- | drivers/uwb/hwa-rc.c | 3 | ||||
| -rw-r--r-- | drivers/uwb/reset.c | 21 | ||||
| -rw-r--r-- | drivers/uwb/umc-bus.c | 2 | ||||
| -rw-r--r-- | drivers/uwb/whc-rc.c | 3 |
4 files changed, 14 insertions, 15 deletions
diff --git a/drivers/uwb/hwa-rc.c b/drivers/uwb/hwa-rc.c index 9052bcb4f528..e7eeb63fab23 100644 --- a/drivers/uwb/hwa-rc.c +++ b/drivers/uwb/hwa-rc.c @@ -887,8 +887,7 @@ static int hwarc_post_reset(struct usb_interface *iface) struct hwarc *hwarc = usb_get_intfdata(iface); struct uwb_rc *uwb_rc = hwarc->uwb_rc; - uwb_rc_post_reset(uwb_rc); - return 0; + return uwb_rc_post_reset(uwb_rc); } /** USB device ID's that we handle */ diff --git a/drivers/uwb/reset.c b/drivers/uwb/reset.c index 70f8050221ff..7f0512e43d9d 100644 --- a/drivers/uwb/reset.c +++ b/drivers/uwb/reset.c @@ -30,6 +30,7 @@ */ #include <linux/kernel.h> #include <linux/err.h> +#include <linux/delay.h> #include "uwb-internal.h" @@ -323,13 +324,15 @@ int uwbd_msg_handle_reset(struct uwb_event *evt) dev_info(&rc->uwb_dev.dev, "resetting radio controller\n"); ret = rc->reset(rc); - if (ret) { + if (ret < 0) { dev_err(&rc->uwb_dev.dev, "failed to reset hardware: %d\n", ret); goto error; } return 0; error: - /* Nothing can be done except try the reset again. */ + /* Nothing can be done except try the reset again. Wait a bit + to avoid reset loops during probe() or remove(). */ + msleep(1000); uwb_rc_reset_all(rc); return ret; } @@ -368,22 +371,20 @@ void uwb_rc_pre_reset(struct uwb_rc *rc) } EXPORT_SYMBOL_GPL(uwb_rc_pre_reset); -void uwb_rc_post_reset(struct uwb_rc *rc) +int uwb_rc_post_reset(struct uwb_rc *rc) { int ret; ret = rc->start(rc); if (ret) - goto error; + goto out; ret = uwb_rc_mac_addr_set(rc, &rc->uwb_dev.mac_addr); if (ret) - goto error; + goto out; ret = uwb_rc_dev_addr_set(rc, &rc->uwb_dev.dev_addr); if (ret) - goto error; - return; -error: - /* Nothing can be done except try the reset again. */ - uwb_rc_reset_all(rc); + goto out; +out: + return ret; } EXPORT_SYMBOL_GPL(uwb_rc_post_reset); diff --git a/drivers/uwb/umc-bus.c b/drivers/uwb/umc-bus.c index 5ad36164c13b..cdd6c8efc9f8 100644 --- a/drivers/uwb/umc-bus.c +++ b/drivers/uwb/umc-bus.c @@ -66,7 +66,7 @@ int umc_controller_reset(struct umc_dev *umc) return -EAGAIN; ret = device_for_each_child(parent, parent, umc_bus_pre_reset_helper); if (ret >= 0) - device_for_each_child(parent, parent, umc_bus_post_reset_helper); + ret = device_for_each_child(parent, parent, umc_bus_post_reset_helper); up(&parent->sem); return ret; diff --git a/drivers/uwb/whc-rc.c b/drivers/uwb/whc-rc.c index 19a1dd129212..1d9a6f54658e 100644 --- a/drivers/uwb/whc-rc.c +++ b/drivers/uwb/whc-rc.c @@ -443,8 +443,7 @@ static int whcrc_post_reset(struct umc_dev *umc) struct whcrc *whcrc = umc_get_drvdata(umc); struct uwb_rc *uwb_rc = whcrc->uwb_rc; - uwb_rc_post_reset(uwb_rc); - return 0; + return uwb_rc_post_reset(uwb_rc); } /* PCI device ID's that we handle [so it gets loaded] */ |