6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Frank Li <Frank.Li@xxxxxxx>
commit 6bf3fc268183816856c96b8794cd66146bc27b35 upstream.
The ibi work thread operates asynchronously with other transfers, such as
svc_i3c_master_priv_xfers(). Introduce mutex protection to ensure the
completion of the entire i3c/i2c transaction.
Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver")
Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
Link: https://lore.kernel.org/r/20231023161658.3890811-2-Frank.Li@xxxxxxx
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i3c/master/svc-i3c-master.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -175,6 +175,7 @@ struct svc_i3c_regs_save {
* @ibi.slots: Available IBI slots
* @ibi.tbq_slot: To be queued IBI slot
* @ibi.lock: IBI lock
+ * @lock: Transfer lock, protect between IBI work thread and callbacks from master
*/
struct svc_i3c_master {
struct i3c_master_controller base;
@@ -203,6 +204,7 @@ struct svc_i3c_master {
/* Prevent races within IBI handlers */
spinlock_t lock;
} ibi;
+ struct mutex lock;
};
/**
@@ -384,6 +386,7 @@ static void svc_i3c_master_ibi_work(stru
u32 status, val;
int ret;
+ mutex_lock(&master->lock);
/* Acknowledge the incoming interrupt with the AUTOIBI mechanism */
writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI |
SVC_I3C_MCTRL_IBIRESP_AUTO,
@@ -460,6 +463,7 @@ static void svc_i3c_master_ibi_work(stru
reenable_ibis:
svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
+ mutex_unlock(&master->lock);
}
static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id)
@@ -1204,9 +1208,11 @@ static int svc_i3c_master_send_bdcast_cc
cmd->read_len = 0;
cmd->continued = false;
+ mutex_lock(&master->lock);
svc_i3c_master_enqueue_xfer(master, xfer);
if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
svc_i3c_master_dequeue_xfer(master, xfer);
+ mutex_unlock(&master->lock);
ret = xfer->ret;
kfree(buf);
@@ -1250,9 +1256,11 @@ static int svc_i3c_master_send_direct_cc
cmd->read_len = read_len;
cmd->continued = false;
+ mutex_lock(&master->lock);
svc_i3c_master_enqueue_xfer(master, xfer);
if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
svc_i3c_master_dequeue_xfer(master, xfer);
+ mutex_unlock(&master->lock);
if (cmd->read_len != xfer_len)
ccc->dests[0].payload.len = cmd->read_len;
@@ -1309,9 +1317,11 @@ static int svc_i3c_master_priv_xfers(str
cmd->continued = (i + 1) < nxfers;
}
+ mutex_lock(&master->lock);
svc_i3c_master_enqueue_xfer(master, xfer);
if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
svc_i3c_master_dequeue_xfer(master, xfer);
+ mutex_unlock(&master->lock);
ret = xfer->ret;
svc_i3c_master_free_xfer(xfer);
@@ -1347,9 +1357,11 @@ static int svc_i3c_master_i2c_xfers(stru
cmd->continued = (i + 1 < nxfers);
}
+ mutex_lock(&master->lock);
svc_i3c_master_enqueue_xfer(master, xfer);
if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
svc_i3c_master_dequeue_xfer(master, xfer);
+ mutex_unlock(&master->lock);
ret = xfer->ret;
svc_i3c_master_free_xfer(xfer);
@@ -1540,6 +1552,8 @@ static int svc_i3c_master_probe(struct p
INIT_WORK(&master->hj_work, svc_i3c_master_hj_work);
INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work);
+ mutex_init(&master->lock);
+
ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler,
IRQF_NO_SUSPEND, "svc-i3c-irq", master);
if (ret)
