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ANDROID: fix up rndis ABI breakage

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Commit 4ce247af3f ("usb: gadget: rndis: add spinlock for rndis
response list") broke the rndis abi by adding a lock to the device
structure.  This is the correct thing to do, to resolve an issue, but
work around this by moving the lock to be a one-lock-per-driver instead
of a per-device lock.  This matches the first submission of this commit,
so it still resolves the same problem, while preserving the ABI for now.

Bug: 161946584
Fixes: 4ce247af3f ("usb: gadget: rndis: add spinlock for rndis response list")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I7c4d32524b7b10f23a15be35f762b1ed9f345b95
This commit is contained in:
Greg Kroah-Hartman
2022-03-12 13:41:37 +01:00
parent d172937367
commit 56d625a4ce
2 changed files with 9 additions and 9 deletions
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17
drivers/usb/gadget/function/rndis.c
View File

@@ -63,6 +63,8 @@ MODULE_PARM_DESC (rndis_debug, "enable debugging");
static DEFINE_IDA(rndis_ida);
static DEFINE_SPINLOCK(resp_lock);
/* Driver Version */
static const __le32 rndis_driver_version = cpu_to_le32(1);
@@ -922,7 +924,6 @@ struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v)
params->resp_avail = resp_avail;
params->v = v;
INIT_LIST_HEAD(&params->resp_queue);
spin_lock_init(&params->resp_lock);
pr_debug("%s: configNr = %d\n", __func__, i);
return params;
@@ -1016,14 +1017,14 @@ void rndis_free_response(struct rndis_params *params, u8 *buf)
{
rndis_resp_t *r, *n;
spin_lock(&params->resp_lock);
spin_lock(&resp_lock);
list_for_each_entry_safe(r, n, &params->resp_queue, list) {
if (r->buf == buf) {
list_del(&r->list);
kfree(r);
}
}
spin_unlock(&params->resp_lock);
spin_unlock(&resp_lock);
}
EXPORT_SYMBOL_GPL(rndis_free_response);
@@ -1033,17 +1034,17 @@ u8 *rndis_get_next_response(struct rndis_params *params, u32 *length)
if (!length) return NULL;
spin_lock(&params->resp_lock);
spin_lock(&resp_lock);
list_for_each_entry_safe(r, n, &params->resp_queue, list) {
if (!r->send) {
r->send = 1;
*length = r->length;
spin_unlock(&params->resp_lock);
spin_unlock(&resp_lock);
return r->buf;
}
}
spin_unlock(&params->resp_lock);
spin_unlock(&resp_lock);
return NULL;
}
EXPORT_SYMBOL_GPL(rndis_get_next_response);
@@ -1060,9 +1061,9 @@ static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length)
r->length = length;
r->send = 0;
spin_lock(&params->resp_lock);
spin_lock(&resp_lock);
list_add_tail(&r->list, &params->resp_queue);
spin_unlock(&params->resp_lock);
spin_unlock(&resp_lock);
return r;
}

1
drivers/usb/gadget/function/rndis.h
View File

@@ -174,7 +174,6 @@ typedef struct rndis_params {
void (*resp_avail)(void *v);
void *v;
struct list_head resp_queue;
spinlock_t resp_lock;
} rndis_params;
/* RNDIS Message parser and other useless functions */