@@ -28,6 +28,7 @@
#include "ipa_reg.h"
#include "ipa_mem.h"
#include "ipa_table.h"
+#include "ipa_smp2p.h"
#include "ipa_modem.h"
#include "ipa_uc.h"
#include "ipa_interrupt.h"
@@ -801,6 +802,11 @@ static int ipa_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
int ret;
+ /* Prevent the modem from triggering a call to ipa_setup(). This
+ * also ensures a modem-initiated setup that's underway completes.
+ */
+ ipa_smp2p_irq_disable_setup(ipa);
+
ret = pm_runtime_get_sync(dev);
if (WARN_ON(ret < 0))
goto out_power_put;
@@ -339,9 +339,6 @@ int ipa_modem_stop(struct ipa *ipa)
if (state != IPA_MODEM_STATE_RUNNING)
return -EBUSY;
- /* Prevent the modem from triggering a call to ipa_setup() */
- ipa_smp2p_disable(ipa);
-
/* Clean up the netdev and endpoints if it was started */
if (netdev) {
struct ipa_priv *priv = netdev_priv(netdev);
@@ -369,6 +366,9 @@ static void ipa_modem_crashed(struct ipa *ipa)
struct device *dev = &ipa->pdev->dev;
int ret;
+ /* Prevent the modem from triggering a call to ipa_setup() */
+ ipa_smp2p_irq_disable_setup(ipa);
+
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
dev_err(dev, "error %d getting power to handle crash\n", ret);
@@ -309,7 +309,7 @@ void ipa_smp2p_exit(struct ipa *ipa)
kfree(smp2p);
}
-void ipa_smp2p_disable(struct ipa *ipa)
+void ipa_smp2p_irq_disable_setup(struct ipa *ipa)
{
struct ipa_smp2p *smp2p = ipa->smp2p;
@@ -27,13 +27,12 @@ int ipa_smp2p_init(struct ipa *ipa, bool modem_init);
void ipa_smp2p_exit(struct ipa *ipa);
/**
- * ipa_smp2p_disable() - Prevent "ipa-setup-ready" interrupt handling
+ * ipa_smp2p_irq_disable_setup() - Disable the "setup ready" interrupt
* @ipa: IPA pointer
*
- * Prevent handling of the "setup ready" interrupt from the modem.
- * This is used before initiating shutdown of the driver.
+ * Disable the "ipa-setup-ready" interrupt from the modem.
*/
-void ipa_smp2p_disable(struct ipa *ipa);
+void ipa_smp2p_irq_disable_setup(struct ipa *ipa);
/**
* ipa_smp2p_notify_reset() - Reset modem notification state
The IPA setup_complete flag is set at the end of ipa_setup(), when the setup phase of initialization has completed successfully. This occurs as part of driver probe processing, or (if "modem-init" is specified in the DTS file) it is triggered by the "ipa-setup-ready" SMP2P interrupt generated by the modem. In the latter case, it's possible for driver shutdown (or remove) to begin while setup processing is underway, and this can't be allowed. The problem is that the setup_complete flag is not adequate to signal that setup is underway. If setup_complete is set, it will never be un-set, so that case is not a problem. But if setup_complete is false, there's a chance setup is underway. Because setup is triggered by an interrupt on a "modem-init" system, there is a simple way to ensure the value of setup_complete is safe to read. The threaded handler--if it is executing--will complete as part of a request to disable the "ipa-modem-ready" interrupt. This means that ipa_setup() (which is called from the handler) will run to completion if it was underway, or will never be called otherwise. The request to disable the "ipa-setup-ready" interrupt is currently made within ipa_modem_stop(). Instead, disable the interrupt outside that function in the two places it's called. In the case of ipa_remove(), this ensures the setup_complete flag is safe to read before we read it. Rename ipa_smp2p_disable() to be ipa_smp2p_irq_disable_setup(), to be more specific about its effect. Fixes: 530f9216a953 ("soc: qcom: ipa: AP/modem communications") Signed-off-by: Alex Elder <elder@linaro.org> --- drivers/net/ipa/ipa_main.c | 6 ++++++ drivers/net/ipa/ipa_modem.c | 6 +++--- drivers/net/ipa/ipa_smp2p.c | 2 +- drivers/net/ipa/ipa_smp2p.h | 7 +++---- 4 files changed, 13 insertions(+), 8 deletions(-)