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authorHans Petter Selasky <hselasky@FreeBSD.org>2021-06-11 15:06:10 +0000
committerHans Petter Selasky <hselasky@FreeBSD.org>2021-06-11 15:06:44 +0000
commit6847ea50196f1a685be408a24f01cb8d407da19c (patch)
treee65befb53fe5ecc70cbfc830d33c64335203c25c /lib
parentfa3746be4203fc9a3414afb21d964eec8bad74f8 (diff)
downloadsrc-6847ea50196f1a685be408a24f01cb8d407da19c.tar.gz
src-6847ea50196f1a685be408a24f01cb8d407da19c.zip
Improve handling of USB device re-open in the LibUSB v1.x API.
Make sure the "device_is_gone" flag is cleared after every successful open, so that the "device_is_gone" flag doesn't persist forever. Found by: sergii.dmytruk@3mdeb.com PR: 256296 MFC after: 1 week Sponsored by: Mellanox Technologies // NVIDIA Networking
Diffstat (limited to 'lib')
-rw-r--r--lib/libusb/libusb10.c9
-rw-r--r--lib/libusb/libusb10_io.c12
-rw-r--r--lib/libusb/libusb20.c5
3 files changed, 24 insertions, 2 deletions
diff --git a/lib/libusb/libusb10.c b/lib/libusb/libusb10.c
index 1c45b87d8f0b..ffe0cf3f366a 100644
--- a/lib/libusb/libusb10.c
+++ b/lib/libusb/libusb10.c
@@ -529,6 +529,15 @@ libusb_open(libusb_device *dev, libusb_device_handle **devh)
libusb_unref_device(dev);
return (LIBUSB_ERROR_NO_MEM);
}
+
+ /*
+ * Clear the device gone flag, in case the device was opened
+ * after a re-attach, to allow new transaction:
+ */
+ CTX_LOCK(ctx);
+ dev->device_is_gone = 0;
+ CTX_UNLOCK(ctx);
+
libusb10_add_pollfd(ctx, &dev->dev_poll, pdev, libusb20_dev_get_fd(pdev), POLLIN |
POLLOUT | POLLRDNORM | POLLWRNORM);
diff --git a/lib/libusb/libusb10_io.c b/lib/libusb/libusb10_io.c
index 53f5b040436d..0e32fc31c8e0 100644
--- a/lib/libusb/libusb10_io.c
+++ b/lib/libusb/libusb10_io.c
@@ -165,8 +165,16 @@ libusb10_handle_events_sub(struct libusb_context *ctx, struct timeval *tv)
err = libusb20_dev_process(ppdev[i]);
if (err) {
- /* set device is gone */
- dev->device_is_gone = 1;
+ /*
+ * When the device is opened
+ * set the "device_is_gone"
+ * flag. This prevents the
+ * client from submitting new
+ * USB transfers to a detached
+ * device.
+ */
+ if (ppdev[i]->is_opened)
+ dev->device_is_gone = 1;
/* remove USB device from polling loop */
libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
diff --git a/lib/libusb/libusb20.c b/lib/libusb/libusb20.c
index 6c2bf721bea9..4323552b83ad 100644
--- a/lib/libusb/libusb20.c
+++ b/lib/libusb/libusb20.c
@@ -608,6 +608,11 @@ libusb20_dev_close(struct libusb20_device *pdev)
pdev->is_opened = 0;
+ /*
+ * Make sure libusb20_tr_get_pointer() fails:
+ */
+ pdev->nTransfer = 0;
+
/*
* The following variable is only used by the libusb v0.1
* compat layer: