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Commit 3b38bb5f authored by Huang Ying's avatar Huang Ying Committed by Len Brown
Browse files

ACPI, APEI, use raw spinlock in ERST 



ERST writing may be used in NMI or Machine Check Exception handler. So
it need to use raw spinlock instead of normal spinlock.  This patch
fixes it.

Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent b72512ed

drivers/acpi/apei/erst.c

+17 −17
Original line number Diff line number Diff line
@@ -86,7 +86,7 @@ static struct erst_erange { 
 * It is used to provide exclusive accessing for ERST Error Log

 * Address Range too.

 */

static DEFINE_SPINLOCK(erst_lock);

static DEFINE_RAW_SPINLOCK(erst_lock);



static inline int erst_errno(int command_status)

{
@@ -421,9 +421,9 @@ ssize_t erst_get_record_count(void) 
	if (erst_disable)

		return -ENODEV;



	spin_lock_irqsave(&erst_lock, flags);

	raw_spin_lock_irqsave(&erst_lock, flags);

	count = __erst_get_record_count();

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);



	return count;

}
@@ -456,9 +456,9 @@ int erst_get_next_record_id(u64 *record_id) 
	if (erst_disable)

		return -ENODEV;



	spin_lock_irqsave(&erst_lock, flags);

	raw_spin_lock_irqsave(&erst_lock, flags);

	rc = __erst_get_next_record_id(record_id);

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);



	return rc;

}
@@ -624,17 +624,17 @@ int erst_write(const struct cper_record_header *record) 
		return -EINVAL;



	if (erst_erange.attr & ERST_RANGE_NVRAM) {

		if (!spin_trylock_irqsave(&erst_lock, flags))

		if (!raw_spin_trylock_irqsave(&erst_lock, flags))

			return -EBUSY;

		rc = __erst_write_to_nvram(record);

		spin_unlock_irqrestore(&erst_lock, flags);

		raw_spin_unlock_irqrestore(&erst_lock, flags);

		return rc;

	}



	if (record->record_length > erst_erange.size)

		return -EINVAL;



	if (!spin_trylock_irqsave(&erst_lock, flags))

	if (!raw_spin_trylock_irqsave(&erst_lock, flags))

		return -EBUSY;

	memcpy(erst_erange.vaddr, record, record->record_length);

	rcd_erange = erst_erange.vaddr;
@@ -642,7 +642,7 @@ int erst_write(const struct cper_record_header *record) 
	memcpy(&rcd_erange->persistence_information, "ER", 2);



	rc = __erst_write_to_storage(0);

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);



	return rc;

}
@@ -696,9 +696,9 @@ ssize_t erst_read(u64 record_id, struct cper_record_header *record, 
	if (erst_disable)

		return -ENODEV;



	spin_lock_irqsave(&erst_lock, flags);

	raw_spin_lock_irqsave(&erst_lock, flags);

	len = __erst_read(record_id, record, buflen);

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);

	return len;

}

EXPORT_SYMBOL_GPL(erst_read);
@@ -719,20 +719,20 @@ ssize_t erst_read_next(struct cper_record_header *record, size_t buflen) 
	if (erst_disable)

		return -ENODEV;



	spin_lock_irqsave(&erst_lock, flags);

	raw_spin_lock_irqsave(&erst_lock, flags);

	rc = __erst_get_next_record_id(&record_id);

	if (rc) {

		spin_unlock_irqrestore(&erst_lock, flags);

		raw_spin_unlock_irqrestore(&erst_lock, flags);

		return rc;

	}

	/* no more record */

	if (record_id == APEI_ERST_INVALID_RECORD_ID) {

		spin_unlock_irqrestore(&erst_lock, flags);

		raw_spin_unlock_irqrestore(&erst_lock, flags);

		return 0;

	}



	len = __erst_read(record_id, record, buflen);

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);



	return len;

}
@@ -746,12 +746,12 @@ int erst_clear(u64 record_id) 
	if (erst_disable)

		return -ENODEV;



	spin_lock_irqsave(&erst_lock, flags);

	raw_spin_lock_irqsave(&erst_lock, flags);

	if (erst_erange.attr & ERST_RANGE_NVRAM)

		rc = __erst_clear_from_nvram(record_id);

	else

		rc = __erst_clear_from_storage(record_id);

	spin_unlock_irqrestore(&erst_lock, flags);

	raw_spin_unlock_irqrestore(&erst_lock, flags);



	return rc;

}